ventilation of deep ocean basins final of deep ocean... · 2013-05-17 · ventilation of deep ocean...
Post on 03-Jul-2020
14 Views
Preview:
TRANSCRIPT
Abyssal Circulation andVentilation of Deep Ocean Basins
Roger LukasKlaus Wyrtki SymposiumKlaus Wyrtki Symposium
April 9, 2013
Upper 1000 m of the Pacific Ocean
Cold water sphere and Warm Water sphere
Sections from J. Reid along ~160W
My Discovery of the DeepMy Discovery of the Deep
• Like Klaus I found the slow abyssalLike Klaus, I found the slow abyssal circulations to be less interesting than the monsoons and El Niñomonsoons and El Niño
• Serendipity and the HOT project changed thatthat
• Klaus and the Conveyor Belt
Indonesian Seas
Solomon and Coral Seas ‐ 1961Solomon and Coral Seas 1961
2TKTw
2z
Kz
w T
The Red Sea ‐ 1974The Red Sea 1974
see also Patzert (1974, Ph.D.)
Wyrtki (1994, unpublished)Wyrtki (1994, unpublished)
annotations/updates by RL
Kauai Deep and Station ALOHAKauai Deep and Station ALOHA
Cold overflow eventsCold overflow events
Cold overflow eventsCold overflow events
Advection ‐ DiffusionAdvection Diffusion
• Classic assumption of steady stateC ass c assu pt o o steady state• Estimates of w given assumptions• Assumptions about constant eddy diffusivityAssumptions about constant eddy diffusivity
zTK
zzTw
tT
T
• No time‐series to do better• HOT provided the opportunity to do better
HOT provided the opportunity to do better• With a simple time‐dependent model, estimates of KT(z,t) were possibleof KT(z,t) were possible
Klaus’ workKlaus work
Enhanced vertical mixingEnhanced vertical mixing
ALOHA CabledALOHA Cabled Observatory
The ALOHA Cabled Observatory
The ALOHA Cabled Observatory
A deep basin internal seiche!
but, I beg to disagreebut, I beg to disagree
Equatorial Theoretical Panel, 1983? @Nova U.@ Nova U.
SummarySummary
• Klaus delighted in discovery –g y• “If you look closer, you will always find something.”
• So, I was wrong – the abyss is interesting:highly episodic– highly episodic
– turbulent kinetic energy greatly enhanced during overflows
– very dynamic• ACO – monitoring the abyss!
Penang, Malaysia/IOC/WESTPAC 1991
photo by W. Patzert
top related